Terminal Velocity of Wheat Stem Nodes versus Internodes for Similar Particle Dimensions

IF 1.2 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
A. Womac, S. E. Klasek, D. Yoder, Doug G. Hayes
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Abstract

Highlights Terminal velocities were measured for wheat stem nodes and internodes for similar particle dimensions to investigate the feasibility of aerodynamic separation. Mean measures of terminal velocities for wheat stem nodes and internodes were 4.91 and 3.35 m s-1, respectively, that coincided with values of 4.92 and 3.37 m s-1 calculated for spherical particles (Mohsenin, 1970). Wheat stem particle mass ranged from 0.015 (internode) to 0.041 g (node) that significantly correlated with terminal velocity ranging from 3.13 to 5.14 m s-1, respectively. Wheat stem particle density ranged from 112 to 297 kg m-3 that significantly correlated with terminal velocity ranging from 3.12 to 5.11 m s-1, respectively. Abstract. Efficient separation of physiological plant components potentially improved the targeting of components to best uses. The terminal velocity property used an opposing air velocity to equilibrate particle weight with the sum of the drag and buoyancy forces. This study used particles of similar dimensions to ascertain the effect of particle mass and density on experimental measures of terminal velocity in a wind tunnel and as calculated by reliable equations. Similar particle diameters, lengths, and volumes of wheat stems ranged from 0.362 to 0.376 cm, 1.25 to 1.28 cm, and 0.131 to 0.141 cm3, respectively. Moisture content was 12% wet basis. Wheat stem internodes had individual particle mass and density ranging from 0.015 to 0.019 g and 113 to 144 kg m-3, respectively, and mean Terminal Velocity Wind Tunnel (TVWT) terminal velocities for wheat stem internodes that ranged from 3.13 to 3.58 m s-1. Nodes had individual particle mass and density ranging from 0.031 to 0.041 g and 236 to 297 kg m-3, respectively, and mean TVWT terminal velocities for wheat stem nodes that ranged from 4.62 to 5.14 m s-1. Thus, no overlap in values was observed for particle mass, particle density, and terminal velocity between wheat stem internode and wheat stem node. This observation supports the potential of using terminal velocity to separate node from internode for similar-sized wheat stems at a given moisture content. Keywords: Aerodynamic separation, Anatomical component, Biomass property, Physical experiment, Sorting, Terminal velocity, Vertical wind tunnel, Wheat stem particles.
相似颗粒尺寸下小麦茎节末速度与节间的关系
为了探讨空气动力分离的可行性,对小麦茎节和茎节间相似颗粒尺寸的末端速度进行了测量。小麦茎节和节间的终端速度平均值分别为4.91和3.35 m s-1,这与球形颗粒的计算值4.92和3.37 m s-1相吻合(Mohsenin, 1970)。小麦茎粒质量在0.015 ~ 0.041 g(节)之间,与末速在3.13 ~ 5.14 m s-1之间显著相关。小麦茎秆颗粒密度在112 ~ 297 kg m-3之间,与终速在3.12 ~ 5.11 m s-1之间显著相关。摘要植物生理成分的有效分离有可能提高成分的靶向性。终端速度特性使用相反的空气速度来平衡颗粒重量与阻力和浮力的总和。本研究使用相似尺寸的粒子来确定粒子质量和密度对风洞中终端速度的实验测量的影响,并通过可靠的方程计算。小麦茎的相似粒径、长度和体积分别为0.362 ~ 0.376 cm、1.25 ~ 1.28 cm和0.131 ~ 0.141 cm3。水分含量为12%湿基。小麦茎秆节间的个体颗粒质量和密度分别为0.015 ~ 0.019 g和113 ~ 144 kg m-3,茎秆节间的平均终端风速(TVWT)为3.13 ~ 3.58 m s-1。小麦茎秆节点的粒子质量和密度分别为0.031 ~ 0.041 g和236 ~ 297 kg m-3,平均TVWT终端速度为4.62 ~ 5.14 m s-1。因此,小麦茎秆节间和茎秆节间的颗粒质量、颗粒密度和终端速度值没有重叠。这一观察结果支持了在一定含水量条件下,利用末端速度将类似大小的小麦茎节与节间分离的可能性。关键词:气动分离,解剖组分,生物量特性,物理实验,分选,终端速度,垂直风洞,小麦茎秆颗粒
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CiteScore
3.10
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